From 2e068c7f2aca6a40bcf1e4c5bc85c26f478fe786 Mon Sep 17 00:00:00 2001
From: Paul Olav Tvete <paul.tvete@qt.io>
Date: Tue, 1 Oct 2019 15:19:37 +0200
Subject: Add TriangleFan pipeline topology

Triangle fan drawing is only supported on some platforms. The feature
flag QRhi::TriangleFanTopology is set accordingly.

In general, TriangleStrip topology will be more efficient on most GPUs.
However, if polygon data is already stored as triangle fans, the CPU
savings may be more significant.

Change-Id: I9704fad751d2119eac8791074f58942dd9315601
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
---
 src/gui/rhi/qrhi_p.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/gui/rhi/qrhi_p.h')

diff --git a/src/gui/rhi/qrhi_p.h b/src/gui/rhi/qrhi_p.h
index 95e9213cac..5b371af727 100644
--- a/src/gui/rhi/qrhi_p.h
+++ b/src/gui/rhi/qrhi_p.h
@@ -1017,6 +1017,7 @@ public:
     enum Topology {
         Triangles,
         TriangleStrip,
+        TriangleFan,
         Lines,
         LineStrip,
         Points
@@ -1426,7 +1427,8 @@ public:
         WideLines,
         VertexShaderPointSize,
         BaseVertex,
-        BaseInstance
+        BaseInstance,
+        TriangleFanTopology
     };
 
     enum BeginFrameFlag {
-- 
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